Technical Terms and Definitions

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1. available bit rate. QOS class defined by the ATM Forum for
ATM networks. ABR is used for connections that do not require
timing relationships between source and destination. ABR
provides no guarantees in terms of cell loss or delays, providing
only best-effort service. Traffic sources adjust their transmission
rate in response to information they receive describing the statue
of the network and its capability to successfully deliver data.
Compare with CBR, UBR, and VBR. 2. area border router. Router
located on the border of one or more OSPF areas that connects
those areas to the backbone network. ABRs are considered
members of both the OSPF backbone and the attached areas.
They therefore maintain routing tables describing both the
backbone topology and the topology of the other areas.